San Marino is a small country located in the Apennine Mountains of Italy. It is officially known as the Most Serene Republic of San Marino. The country has a population of around 33,000 people. San Marino is a landlocked country and does not have an airport. The country is surrounded by Italy. To call San Marino from Bangladesh, you will need to use an international calling service. You will need to dial the country code of San Marino, which is 378, followed by the phone number you are trying to reach.